By Nell Mackenzie LONDON (Reuters) - Muddy Waters has taken a short position in cosmetics company Elf Beauty, the hedge fund’s chief executive Carson Block said at the Sohn conference in London on Wednesday. Shares in Elf were down 10% on the day after Block alleged at the event that Elf had overstated its revenue over the past three years, possibly by as much as $190 million. California-based

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